No dice. The mouse now doesn't work AT ALL. Before I edited the mouse.xml file, I could get some kind of control from the upper left of the screen....now, nothing.
I may have completely messed up my mouse.xml file....how do I get the original back?!

You can use this mouse.xml as it is. And again: would be good idea to copy this file into folder /home/xbian/.kodi/userdata/keymaps and edit it there because if you don't, those changes will be overwitten by xbian-package-xbmc update

<pvr>
<minvideocachelevel>5</minvideocachelevel> <!-- Cache up to this level in the video buffer buffer before resuming playback if the buffers run dry. -->
<minaudiocachelevel>5</minaudiocachelevel> <!-- Cache up to this level in the audio buffer before resuming playback if the buffers run dry. -->
<cacheindvdplayer>false</cacheindvdplayer> <!-- Cache PVR stream in DVDPlayer. -->
</pvr>